WSP03321

• File Number: 8141.400
• Description: Fryingpan-Arkansas Project - Report
• State: CO
• Basin: Arkansas
• Water Division: 5
• Date: 7/1/1982
• Author: US DoI BoR
• Title: Fryingpan-Arkansas Project Under Construction
• Water Supply Pro - Doc Type: Project Overview

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Fryingpan-Arkansas Projeqt

Leadville. The reservoir storage capacity is 129,440 acre-
feet. Sugar Loaf Dam is au earthfill structure, has a
leugth of 2,020 feet, a height ahove riverbed of 13~ feet,
aud coutains approximately 1,833,700 cubic yards of
material. In addition to the main earthfill section of the
dam, there is a dike about 6,000 feet to the northeast.
This dike is 475 feet long and 11 feet high. The spillway
has a capacity of 2,920 cubic feet per second and consists
of a morning-glory intake structure, a 16.5-foot-diameter
monolithic concrete conduit, a chute aud a stilling basin.
The outlet works consists of an intake structure with
trashracks, a 7-Ioot-diameter concrete conduit with a
steel liner, a gate chamber housing a 5- by 6-foot high-
pressure gate, an II-foot-diameter concrete conduit with
a steel liner , a 72-inch-diameter steel outlet pipe which
bifurcates into two parallel branches just ahead of the
control house for the river outlet, a river outlet control
house with two 3.5-foot-square high-pressure gates for
each branch, and a chute and stilling basin discharging
to Lake Fork. A short 72-inch-diameter steel branch
outlet pipe with a bulkhead was provided upstream from
the bifurcation for future use, and as an outlet to the Mt.
Elbert Conduit. The capacity of the river outlet is 1,120
cubic feet per second, and the capacity of the outlet to
the Mt. Elbert Conduit is 370 cubic feet per second.

Pueblo Dam and Reservoir

Pueblo Dam is the terminal storage feature for the
Fryingpan-Arkansas Project. The dam is located on
the Arkansas River in Pueblo County about 6 miles
upstream and west of the city of Pueblo. The reservoir
bas a total storage capacity of 357,678 acre-feet: 30,355
acre-feet of dead and inactive capacity; 234,347 acre-feet
of conservation capacity; 65,952 acre-feet of joint-use
capacity; and 27,024 acre-feet of exclusive flood-control
capacity. The concrete dam and massive-head buttress-
type spillway structure is the principal control structure
for the reservoir. The concrete section is 1,750 feet wide
with a maximum structural height of 250 feet. The
spillway has a crest width of 550 feet and was designed
for a maximum spill discharge of 191,500 cubic feet per
second. The river outlet works is controlled by two
4-foot-square high-pressure gates and regulates normal
water releases into tbe river. Additional releases may be
made to the river through three separate spillway outlet
works. Each is controlled by two 6- by 6.5-foot higb-
pressure gates. Delivery of water for municipal and in-
dustrial use is made from the south outlet works, which
is a multilevel intake structure capable of taking water
from the reservoir at different levels, thus providing a
degree of control over water temperature and quality.
Water deliveries from the fish hatchery outlet works have
similar controls. Included in the outlet works are a still-
ing basin and outlet channel, a concrete river plug in the
river chanhel, and the Bessemer Ditch headworks.

Sugar Loaf Dam and Turquoise Lake

Mt. Elbert Forebay Dam and Reservoir

Mt. Elbert Forebay occupies a saddle on a ridge above
Twin Lakes Reservoir. The forebay will be impounded
by a da*, on the north side and a dike on the south rim.
An outl~t channel from the southeast corner of the
reservoir will connect to the inlet-outlet structure for the
powerpIant peustock. The rolled earthfill forebay dam is
about 2;600 feet long and 92 feet high. A I30-foot-long
earth dike closes a low saddle at the southwest end of
the reservoir. In 1980, the forebay was lined with a
45-mil reinforced chlorinated polyethyleue flexible mem-
brane liring material for seepage control. There is no
spillway in the forebay dam. There is also no outlet
works, other than the penstock inlet-outlet structure.
Natural! flow into the reservoir is negligible.

Twin L~kes Dam and Reservoir

Twin Lakes Dam and Reservoir will be located approx-
imately ~3 miles south of Leadville, iu Lake County.
The res1rvoir will have a total capacity of 141,000 acre-
feel. Thf dam will be a zoned, rolled earthfill structure
with a ~eight above streambed of 53 feet. The crest of
the dam wilI be 30 feet wide aud 3,150 feet long. The
spillwaylwill be ou the left abutment of the dam, and
will havf a capacity of 1,400 cubic feet per second. The
spillway! will be an uncontrolled concrete morning-glory
inlet strJ..lcture with a 9.foot-diameter concrete conduit
under the dam embankment and a concrete stilling
basin. A chanuel downstream from the stilling basin will
carry thi' water to Lake Creek. The outlet works located
in the rIght abutment will deliver 3,465 cubic feet per
second (0 the river. The outlet works will have an inlet
structur~ with trashracks, a 12.foot-diameter concrete
conduit iwith steel liner, and a gate chamber housing a
9.0- by 12.0-foot high-pressure gate. A 16.75-foot.diameter
horseshf?e-shaped concrete conduit containing a 12.0-foot-
diameter steel outlet pipe will lead from the gate